Fake Emerald.
An example of the element Zirconium

Fake Emerald.
This is a fake (cubic zirconia based) emerald from http://www.pehnec.com. We once thought the color was from yttrium, but now I doubt that, so it's been moved under zirconium because that's the one thing I do believe about it.Source:Pehnec GemsContributor:Ed Pegg JrAcquired:15 July, 2002Text Updated:7 April, 2009Price: $10Size: 0.4"Purity: 74%